Paper and pulp screening machine



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EDWARD B. FRITZ, 03F OHJICAGr, ELLINOIS.

PAPER .AND PULP SCJBJlElENNGr MACHJINE.

Application led. January 20, 1928.

My invention is in a class of machines for screening material used in pulp and paper making.

Among the primary objects of my invention is a screening machine wherein the material to be used is fed continuously into a screening member which screening member is reciprocally functioned whereby the material to be screened is tossed back and forth while the screening p-rocess is done both by the lateral tossing and the gravity of the material. Another primary object is such a machine wherein foreign matter and ingredients too large to harmoniously screen with the homogeneous material are by gravity carried to a separating device and from thence delivered from the machine without limiting the continuous functioning of the machine. A further obj ect is the delivery of the screened ma terial by gravity below the screening device to a point whence it may continuously be delivered away from the screening machine.

ln the accompanying drawings l show an embodiment of my device, in which Fig. 1 is a sectional elevation, F ig. 2 is a sectional elevation of F ig. 1 along the arrow lines 1-1. Fig. 3 is `a top surface view with a portion broken away.

As illustrated my device consists of a primary receptacle or tank consisting preferably of end walls 5 and 6 and a side wall 7 but there is no limitation as to the shape of the said tank. ln the end walls of said tank ll provide bearings 8 and 9 for the functioning of an operative device and show both of these bearings as being provided with an external opening; but I may make one of these bearings to open internally and externally and the other bearing a boss with no external opening or wholly within the tank. In the bottom of this tank ll provide an outlet 10 controlled by a valve 11 for the passage of material which has been screened. Assembled in the said tank and operatively functioning in said bearings 3 and 9 ll provide a functionally mounted screening device consisting primarily of a tubular member 12-said tubular member having one' end closed and the opposite end controlled by a valve 15, and provided with a channel beginning with a restricted aperture 13 at the closed end of the said tubular member and tapering to a` larger aperture 1li at the valve controlled outlet. In the upper longitudinal portion of the tubular member 12 ll provide a series of longitudinal slots 16 opening into the channel in the tubular member 12,

Serial No. 248,050.

also opening into -a screening chamber to be hereinafter described and l may provide apertures or slots in the lower wall thereof. lixedly mounted on the tubular member 12 l provide a chamber enclosed by end walls 17 and 18 and between said end walls separating ribs 19 and 20. Formed on and attached to the said walls and separating ribs l provide a screening structure 22 preferably sheet metalextending almost around the separating ribs and connecting with the heretofore described end walls. l provide a series of longitudinally extending bars 21 adapted to unify the parts described and at the same time operate as bailies. The screen 22 has an opening at the top and preferably the length of the screen, with aprons at 23 and 29 inwardly bent at their extremities forming a conical entry for the material to be screened and prevent ing the back-splashing of the material upwardly. The screen 22 is punctured by a series of slots 23 spaced apart and running in a vertical direction as related to the position of the machine, these slots 23 have no limited relation as far as one series is related to the other-except that they are speciiically punctured in a vertical direction. rllhe rows of said slots 23 extend from the upper area of the screening wall portion of the device in spaced series to approximately the bottom portion of the screening wall where the said wall is attached to the shaft member 12. A preferable manipulating method is an arm 2A which is pivotally functioned on a pinion 25 on the chamber and a pinion 27 on a reciprocating member 26 whereby the chamber is impelled back and forth over a. portion of the tank area as indicated by the dotted lines in ltig. 2.

'lhe principle involved is that the screening part of the mechanism-consisting of a cl1amber on the cylindrical shaft-is reciprocating while the material t-o be screened is delivered into the opening at the top; and having descended through the said opening into the chamber the structure of said opening is such that the material tossedfback and forth in the said screen is not able to return out of said opening. As the material being operated upon descends by gravity into the said chamber it is thrown from side to side both striking the batlies and the circular side walls of the chamber. As the material is thus thrown against the circular walls of the chamber gravity and centrifugal action forces the material delivered therein through the vertical slots, the said screened material dropping by gravity into the tank surrounding the said reciprocating portion. Meanwhile, substances of such structure and nature as to be unfitted to pass through the vertical slots gravitate to what is practically the floor of the chamber, said floor having't-hereon horizontal slots entering into the cavity of the tubular member whereby the unscreenable material is automatically delivered into the hollow shaft and by reason of its internal inclination such material is driven downward to that end of the tubular member which is formed as an outlet for such foreign or unscreenable material. As the hollow portion i3 and 14 of the tubular member l2 becomes more or less full with the'material not responsive to screening it is removed through the valve l5. The aperturesin the bottom wall of the tubular member permit the passage into Lhe tank of such sereenable material as passes through the upper tubular slots.

It will be observed that there is a peculiar virtue claimed in the position-of the slots in the chamber wall. The material being thrown against said wall finds its way readily therethrough tending to more perfectly produce a homogeneous mixture when the same is delivered therefrom. It will be further observed/that the. process is a continuous process, the material being delivered into the operative chamber at such speed as experience demonstrates the slots will take care of it, the material having been operated upon and screened passes out of contact with the functioning portion and is free to go on its way continuously to a point of use. There is no detailed definition limit, only in so far as I am limit-ed by the scope of the claims. l

I claim:

l. A paper and pulp screening machine including a stationary vessel, a chamber operatively mounted therein upon a shaft journaled in walls of the vessel, screening means forming part of said chamber, anoutlet from said vessel, an inlet to said chamber, means to reciprocate said chamber upon said shaft whereby-to operate upon the material delivered into said chamber and screen the same into the stationary vessel.

2. In a screening device a primary tank having its top open, and an outlet .at the bottom thereof; operatively assembled in said tank a chamber fixedly mounted upon a shaft journalled in the walls of said tank, said chamber having circular wall forms containing vertically spaced-apart slots in rows adjacent one another; said mounted chamber having means associated therewith for a measured reciprocatory movement.

3. In a device for screening paper and pulp stock a stationary tank having its top open and having an opening outlet in or adjacent the bottom thereof; bearings in said tank whose axial centres are above the level of the outlet; assembled in the said, bearings a substantially tubular member having a valve controlled outlet at one end thereof; mounted on said tubular member and movable therewith a chamber adapted to receive materials to be screened; screening means consisting of vertical slots in the walls of said chamber; means associated between the said chamber and a power delivery means whereby said chamber is reciprocated over a pre-determined area.

4. In a device for the purposes described a primary stationary vessel having a top opening, an outlet adjacent the bottom thereof; journals in opposite walls thereof; a mounted member operable in said journals, said member comprising a substantially tubular axis and mounted thereon a chamber having means at the top thereof for the reception of material to be screened, the walls thereof being vertically slotted for screening the material operated upon; means for separating foreign or unscreenable material from the screenable material5means to autonlatically deliver said foreign and unscreenable material into a chamber in the tubular axis; and means to deliver the said unscreenable and foreign materials away from said mechanism withoutlimiting the movements of said mechanism.

5. A paper and pulp screening machine comprising a primary stationary vessel having a top opening and an outlet adjacent the bottom thereof; journals on the vessel walls said journals being at an elevation above the highest point of the outlet of said vessel; functionally mounted in said journals a substantially circular receptacle its axis of movement being horizontal and said axis being on the circumference of the said receptacle whereby said receptacle may be subject to a reciprocal movement; means associated with said receptacle and with a power transmitting means whereby to impart reciprocal movement to the said receptacle; means for receiving into the said receptacle material for pulp and paper making; means to screen the said material in and through said receptacle continuously by gravity and centrifugal action.

6. A paper and pulp screening machine comprising a primary stationary vessel having a top opening and an outlet adjacent the bottom thereof; journals on the vessel walls said journals being at an elevation above the highest point of the outlet of said vessel; functionally mounted in said journals a substantially circular receptacle its axis of movement being horizontal and said axis being on the circumference of the said receptacle whereby said receptacle may be subject to a reciprocal movement; means associated with said receptacle and with a power transmitting means whereby to impart reciprocal movement to the said receptacle; means for receiving into the said receptacle material for pulp and paper making; means to screen the said material in and through said receptacle continuously by gravity and centrifugal action; means to deliver from said machine a continuous flow of screened material by continuous operation through the receptacle.

7.. A paper and pulp screening machine comprising a primary stationary vessel having a top opening and an outlet adjacent the bottom thereof; journals on the vessel Walls, said journals being at an elevation above the highest point of t-he outlet of said vessel; functionally mounted in said journals a substantially circular receptacle its axis of movement being horizontal and said axis being on the circumference of the said receptacle whereby said receptacle may be subject to a reciprocal movement; means associated with said receptacle and with a power transmitting means whereby to impart reciprocal movement to the said receptacle; means for receiving into the said receptacle material for pulp and paper making; means to screen the said material in and through said receptacle continuously by gravity and centrifugal action; means to deliver from said machine a continuous :flow of screened material by continuous operation through the receptacle; means to continuously receive material into said receptacle, to screen said material and means to separate therefrom foreign and nonscreenable material through a separate outlet.

8. ln a device for the purposes described a primary stationary tank having an inlet and an outlet; functionally associated with said tank a substantially tubular member; fixedly attached to and functioning with said tubular member a substantially circular chamber having an inlet at the top thereof with outlets into the tubular member and into the t-ank; means for reciprocally functioning the circular chamber on the tubular member axis over a pre-determined area whereby to operate upon material delivered into said circular chamber and screen the said material, to deliver the screened material into the tank by reason of gravity and centrifugal action, to automatically separate from the said material delivered into the circular chamber all unscreenable and foreign material and to d'eposit the same into a chamber contained in the tubular member; means for a delivery of said unscreenable material apart from the screened material.

A device for the purposes described comprlsing a primary stationary vessel having a neeaeoe top opening andan outlet adjacent the bottom thereof; functionally mounted on the circumference of a tubular shaft rockingly journaled in the said vessel a screening chamber consisting of a substantially circular wall having an entry opening in the top thereof; means for reciprocating said chamber upon said tubular shaft as its axis; means for screening through the circular walls of said chamber material delivered therein; means for separating from the said material operated upon all foreign and' unscreenable po-rtitl tions and delivering the same into a chamber of the shaft; means for delivering said foreign and unscreenable material from the said shaft.

10. A device for the purposes described comprising a primary stationary vessel having a top opening and an outlet adjacent the bottom thereof; functionally mounted in the said vessel a screening chamber consisting of a substantially circular Wall having an entry opening in the top thereof and mounted upon a tubular shaft said shaft being on the circumference of the circular chamber; means for reciprocating said chamber upon said tubular shaft as its axis; means for screening through the circular walls of said chamber material delivered therein through the opening at the top thereof; means for separating from the said material operated u-pon all foreign and unscreenable portions and delivering the same into a chamber of the shaft; means for automatically delivering said foreign and unscreenable material to one end of the said shaft; means for delivering said foreign and unscreenable material from the said shaft.

11. A paper and pulp screening machine comprising primarily a stationary vessel; functionally mounted in said vessel a screening chamber mounted radially upon a tubular shaft, said screening chamber being substantially circular and having an entry opening in the top thereof; means for screening through the circular walls of said chamber; means for automatically separating from the material screened foreign and unscreenable portions and delivering the same into a channel in the tubular shaft; means in the lower wall of the tubular shaft to screen portions of the material delivered into said shaft during its process through said shaft.

Signed at Chicago, lll., this 13th day of January; 1928.

EDWD B. Fltll'll. 

